The SUPRA SBD-1303 speaker system consists of two car speakers with a circular shape and a size of 13 cm, designed for use in regular places inside the car: doors and rear. The best sound of the speakers is achieved together with the car stereo, but the use of an amplifier is not excluded. The tweeter is equipped with a polypropylene diffuser. The voice coil is cooled through the use of a special fluid and can be used in a highly loaded mode. Overheating is excluded. The SUPRA SBD-1303 two-way car speakers have an impedance of 4 ohms and a sensitivity of 90 dB. These characteristics allow the acoustics to reproduce impeccable sound with a small size.